Fire Emblem Heroes Wiki Guide

Olivia

For the love of all things holy, once you recruit both the 2* and 3* Olivia, KEEP THEM BOTH!! She's one of the most valuable units in the game by nature of her ability to Dance and gave another unit another turn. This will be critical to get the first attack in for arena battles, and helpful for the main quest as well. So the main reason to keep them both is that you can level and upgrade one up as high as you can, and keep the other at a level that matches your arena team, should they not happen to be your highest level units. But in general you should use your highest level units for the highest score...except if you have a lower level team that includes one of the bonus units, then that will be worth more points. End ramble.